linux-kernel - Re: [PATCH 07/11] mfd: flexcard: add UIO IRQ devices

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Date:	Mon, 30 Mar 2015 09:57:02 +0100
From:	Lee Jones <lee.jones@...aro.org>
To:	Holger Dengler <dengler@...utronix.de>
Cc:	linux-kernel@...r.kernel.org, Peter Mahler <mahler@...ug.com>,
	Juergen Bubeck <bubeck@...ug.com>,
	Benedikt Spranger <b.spranger@...utronix.de>,
	Samuel Ortiz <sameo@...ux.intel.com>
Subject: Re: [PATCH 07/11] mfd: flexcard: add UIO IRQ devices

On Wed, 25 Mar 2015, Holger Dengler wrote:

> From: Benedikt Spranger <b.spranger@...utronix.de>
> 
> Add an UIO device for each Flexcard Flexray related trigger. The trigger
> devide into:
>  - Flexray cycle start (CCYS)
>  - Flexray timer 0 (CCxT0)
>  - Bus wakeup (WAKE)
> 
> The UIO IRQ devices can be used to synchronize an application
> with these events.
> 
> Signed-off-by: Holger Dengler <dengler@...utronix.de>
> Signed-off-by: Benedikt Spranger <b.spranger@...utronix.de>
> cc: Samuel Ortiz <sameo@...ux.intel.com>
> cc: Lee Jones <lee.jones@...aro.org>
> ---
>  drivers/mfd/flexcard/core.c     | 52 +++++++++++++++++++++++++++++++++++++++++
>  drivers/mfd/flexcard/flexcard.h | 23 ++++++++++++++++++
>  2 files changed, 75 insertions(+)
> 
> diff --git a/drivers/mfd/flexcard/core.c b/drivers/mfd/flexcard/core.c
> index a6f92b4..cd06854 100644
> --- a/drivers/mfd/flexcard/core.c
> +++ b/drivers/mfd/flexcard/core.c
> @@ -19,6 +19,7 @@
>  #include <linux/miscdevice.h>
>  #include <linux/pci.h>
>  #include <linux/platform_device.h>
> +#include <linux/uio_driver.h>
>  #include <linux/mfd/core.h>
>  #include <linux/mfd/flexcard.h>
>  
> @@ -51,6 +52,42 @@ static struct mfd_cell flexcard_clk_dev[] = {
>  	},
>  };
>  
> +irq_res(CC1CCYS);
> +irq_res(CC2CCYS);
> +irq_res(CC3CCYS);
> +irq_res(CC4CCYS);
> +irq_res(WAKE4A);
> +irq_res(WAKE4B);
> +irq_res(WAKE3A);
> +irq_res(WAKE3B);
> +irq_res(WAKE2A);
> +irq_res(WAKE2B);
> +irq_res(WAKE1A);
> +irq_res(WAKE1B);
> +irq_res(CC1T0);
> +irq_res(CC2T0);
> +irq_res(CC3T0);
> +irq_res(CC4T0);

flexcard_irq_resource();

> +static struct mfd_cell flexcard_uio_dev[] = {
> +	flexcard_irq_cell(CC3CCYS, 0),
> +	flexcard_irq_cell(CC4CCYS, 1),
> +	flexcard_irq_cell(WAKE4A, 2),
> +	flexcard_irq_cell(WAKE4B, 3),
> +	flexcard_irq_cell(WAKE3A, 4),
> +	flexcard_irq_cell(WAKE3B, 5),
> +	flexcard_irq_cell(WAKE2A, 6),
> +	flexcard_irq_cell(WAKE2B, 7),
> +	flexcard_irq_cell(WAKE1A, 8),
> +	flexcard_irq_cell(WAKE1B, 9),
> +	flexcard_irq_cell(CC1CCYS, 10),
> +	flexcard_irq_cell(CC2CCYS, 11),
> +	flexcard_irq_cell(CC1T0, 12),
> +	flexcard_irq_cell(CC2T0, 13),
> +	flexcard_irq_cell(CC3T0, 14),
> +	flexcard_irq_cell(CC4T0, 15),
> +};
> +
>  static int flexcard_tiny_can(struct flexcard_device *priv,
>  			     int idx, int id, u32 offset)
>  {
> @@ -150,6 +187,15 @@ static int flexcard_clk_setup(struct flexcard_device *priv)
>  			       &pdev->resource[0], 0, NULL);
>  }
>  
> +static int flexcard_add_uio(struct flexcard_device *priv)
> +{
> +	struct pci_dev *pdev = priv->pdev;
> +
> +	return mfd_add_devices(&pdev->dev, 0, flexcard_uio_dev,
> +			       ARRAY_SIZE(flexcard_uio_dev),
> +			       NULL, 0, priv->irq_domain);

Again, any reason why you have yet another call do mfd_add_devices()?

> +}
> +
>  static int flexcard_misc_open(struct inode *inode, struct file *filp)
>  {
>  	struct flexcard_device *priv =
> @@ -284,6 +330,12 @@ static int flexcard_probe(struct pci_dev *pdev,
>  		goto out_remove;
>  	}
>  
> +	ret = flexcard_add_uio(priv);

Not sure you need a special function just to call mfd_add_devices().

> +	if (ret) {
> +		dev_err(&pdev->dev, "unable to add irq UIO devices: %d", ret);
> +		goto out_remove;
> +	}
> +
>  	ret = misc_register(&priv->dev);
>  	if (ret) {
>  		dev_err(&pdev->dev, "unable to register miscdevice: %d\n", ret);
> diff --git a/drivers/mfd/flexcard/flexcard.h b/drivers/mfd/flexcard/flexcard.h
> index 038c138..0d05f78 100644
> --- a/drivers/mfd/flexcard/flexcard.h
> +++ b/drivers/mfd/flexcard/flexcard.h
> @@ -6,4 +6,27 @@ void flexcard_misc_del_attrs(struct device *dev);
>  int flexcard_setup_irq(struct pci_dev *pdev);
>  void flexcard_remove_irq(struct pci_dev *pdev);
>  
> +#define irq_res(irq_name)						\
> +	static struct resource flexcard_irq_res_##irq_name = {		\
> +		.name = __stringify(fc_irq_##irq_name##_off),		\
> +		.start  = FLEXCARD_IRQ_##irq_name##_OFF,		\
> +		.end  = FLEXCARD_IRQ_##irq_name##_OFF,			\
> +		.flags  = IORESOURCE_IRQ,				\
> +	};								\
> +									\
> +	static struct uio_info flexcard_irq_pdata_##irq_name = {	\
> +		.name   = __stringify(irq_name),			\
> +		.version = "0",						\
> +	}
> +
> +#define flexcard_irq_cell(irq_name, irq_id)				\
> +	{								\
> +		.id = irq_id,						\
> +		.name = "uio_pdrv_genirq",				\
> +		.platform_data = &flexcard_irq_pdata_##irq_name,	\
> +		.pdata_size = sizeof(flexcard_irq_pdata_##irq_name),	\
> +		.num_resources = 1,					\
> +		.resources = &flexcard_irq_res_##irq_name		\
> +	}

Any reason these aren't in the *.c file?

-- 
Lee Jones
Linaro STMicroelectronics Landing Team Lead
Linaro.org │ Open source software for ARM SoCs
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